Dastgerdi, Aref S.Peterman, Robert J.Beck, B. TerryRiding, Kyle A.2021-04-022021-04-022021-03-01https://hdl.handle.net/2097/41316The effect of concrete composition on end-splitting cracks in pretensioned concrete members was investigated. Specific parameters included the effect of aggregate shape and content, water-to-cementitious (w/cm) ratio, fly ash, paste and air void content. For each mixture evaluated, prisms were load tested in three-point bending at 4000, 6000 and 8000 psi to determine the effect of concrete compressive strength on crack growth potential. Corresponding splitting tensile tests were also conducted on samples at each compressive strength for all mixtures. Results show that increasing angularity, aggregate size distribution, and decreasing w/cm ratio improve fracture toughness by as much as 28% whereas changing other parameters had little effect. All improving factors were seen to be most effective at low strengths. A statistical model predicting fracture toughness was developed, and the results correlated well with observed cracking in pretensioned concrete members.This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).https://rightsstatements.org/vocab/InC/1.0/Fracture ToughnessTwo-Parameter ModelTpmPrestressed ConcreteLongitudinal Splitting CracksText